diff --git a/src/dune b/src/dune
index 1220adcd..edf2cdf6 100644
--- a/src/dune
+++ b/src/dune
@@ -11,7 +11,8 @@
   (targets status_types.ml status_types.mli
            status_pb.ml status_pb.mli
            status_pp.ml status_pp.mli)
-  (deps (:file status.proto))
+  (deps (:file status.proto)
+        (source_tree %{project_root}/vendor/opentelemetry-proto/))
   (action (run ocaml-protoc %{file} -ml_out . -pp -binary)))
 
 (rule
@@ -19,7 +20,8 @@
            common_pb.ml common_pb.mli
            common_pp.ml common_pp.mli)
   (deps
-    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/common/v1/common.proto))
+    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/common/v1/common.proto)
+    (source_tree %{project_root}/vendor/opentelemetry-proto/))
   (action (run ocaml-protoc %{file}
                -I %{project_root}/vendor/opentelemetry-proto/
                -ml_out . -pp -binary)))
@@ -29,7 +31,8 @@
            resource_pb.ml resource_pb.mli
            resource_pp.ml resource_pp.mli)
   (deps
-    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/resource/v1/resource.proto))
+    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/resource/v1/resource.proto)
+    (source_tree %{project_root}/vendor/opentelemetry-proto/))
   (action (run ocaml-protoc %{file}
                -I %{project_root}/vendor/opentelemetry-proto/
                -ml_out . -pp -binary)))
@@ -39,7 +42,8 @@
            trace_pb.ml trace_pb.mli
            trace_pp.ml trace_pp.mli)
   (deps
-    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/trace/v1/trace.proto))
+    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/trace/v1/trace.proto)
+    (source_tree %{project_root}/vendor/opentelemetry-proto/))
   (action (run ocaml-protoc %{file}
                -I %{project_root}/vendor/opentelemetry-proto/
                -ml_out . -pp -binary)))
@@ -49,7 +53,8 @@
            metrics_pb.ml metrics_pb.mli
            metrics_pp.ml metrics_pp.mli)
   (deps
-    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/metrics/v1/metrics.proto))
+    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/metrics/v1/metrics.proto)
+    (source_tree %{project_root}/vendor/opentelemetry-proto/))
   (action (run ocaml-protoc %{file}
                -I %{project_root}/vendor/opentelemetry-proto/
                -ml_out . -pp -binary)))
@@ -58,7 +63,8 @@
   (targets metrics_service_types.ml metrics_service_types.mli
            metrics_service_pp.ml metrics_service_pp.mli
            metrics_service_pb.ml metrics_service_pb.mli)
-  (deps (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/collector/metrics/v1/metrics_service.proto))
+  (deps (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/collector/metrics/v1/metrics_service.proto)
+    (source_tree %{project_root}/vendor/opentelemetry-proto/))
   (action (run ocaml-protoc %{file}
                -I %{project_root}/vendor/opentelemetry-proto/
                -ml_out . -pp -binary)))
@@ -68,7 +74,8 @@
            trace_service_pp.ml trace_service_pp.mli
            trace_service_pb.ml trace_service_pb.mli)
   (deps
-    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/collector/trace/v1/trace_service.proto))
+    (:file %{project_root}/vendor/opentelemetry-proto/opentelemetry/proto/collector/trace/v1/trace_service.proto)
+    (source_tree %{project_root}/vendor/opentelemetry-proto/))
   (action (run ocaml-protoc %{file}
                -I %{project_root}/vendor/opentelemetry-proto/
                -ml_out . -pp -binary)))